At next step, a page with modify options will be added.
The first two options would be to modify the option that a user would be notified when an email expire.
The second option would be to expand the life span of an account by changing the date limitation and redirection number.
After this I will start to concentrate me on a whitelist function, so TrashMail accounts could be used better in the Usenet newsgroups and as Forum user.

Notified BEFORE email expire. Using url in notification it should possible to extend life of address for another 10000 emails and 6 months or something like that.

Does it need to be optional how much (msgs / days) the notification with modification url is sent?

Naturally all this information is available from every email headers. But separate notification email is still preferred. Let's say that it's address that needs to be functional but it hasn't been used for last 6 months anyway.

Notified BEFORE email expire. Using url in notification it should possible to extend life of address for another 10000 emails and 6 months or something like that.

Ok to notify before email address is deleted and when its deleted.
What do you mean with url in notification? A link to go to the modification page? For modification you will be prompted by your login and password, because unfortunality, if all is in URL, proxy servers have in their log files your login and password!

Does it need to be optional how much (msgs / days) the notification with modification url is sent?

You mean you like to be remembered regulary about your TrashMail email address status?

Naturally all this information is available from every email headers. But separate notification email is still preferred. Let's say that it's address that needs to be functional but it hasn't been used for last 6 months anyway.